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<title>class OptionParser::Switch - optparse: Ruby Standard Library Documentation</title>


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    <li ><a href="#method-c-guess">::guess</a>
    <li ><a href="#method-c-incompatible_argument_styles">::incompatible_argument_styles</a>
    <li ><a href="#method-c-new">::new</a>
    <li ><a href="#method-c-pattern">::pattern</a>
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    <main role="main" aria-labelledby="class-OptionParser::Switch">
    <h1 id="class-OptionParser::Switch" class="class">
      class OptionParser::Switch
    </h1>

    <section class="description">
    
<p>Individual switch class.  Not important to the user.</p>

<p>Defined within <a href="Switch.html"><code>Switch</code></a> are several Switch-derived classes: <a href="Switch/NoArgument.html"><code>NoArgument</code></a>, <a href="Switch/RequiredArgument.html"><code>RequiredArgument</code></a>, etc.</p>

    </section>

      <section id="5Buntitled-5D" class="documentation-section">



        <section class="attribute-method-details" class="method-section">
        <header>
        <h3>Attributes</h3>
        </header>

          <div id="attribute-i-arg" class="method-detail">
            <div class="method-heading attribute-method-heading">
              <span class="method-name">arg</span><span
                class="attribute-access-type">[R]</span>
            </div>

            <div class="method-description">
              
              </div>
            </div>
          <div id="attribute-i-block" class="method-detail">
            <div class="method-heading attribute-method-heading">
              <span class="method-name">block</span><span
                class="attribute-access-type">[R]</span>
            </div>

            <div class="method-description">
              
              </div>
            </div>
          <div id="attribute-i-conv" class="method-detail">
            <div class="method-heading attribute-method-heading">
              <span class="method-name">conv</span><span
                class="attribute-access-type">[R]</span>
            </div>

            <div class="method-description">
              
              </div>
            </div>
          <div id="attribute-i-desc" class="method-detail">
            <div class="method-heading attribute-method-heading">
              <span class="method-name">desc</span><span
                class="attribute-access-type">[R]</span>
            </div>

            <div class="method-description">
              
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          <div id="attribute-i-long" class="method-detail">
            <div class="method-heading attribute-method-heading">
              <span class="method-name">long</span><span
                class="attribute-access-type">[R]</span>
            </div>

            <div class="method-description">
              
              </div>
            </div>
          <div id="attribute-i-pattern" class="method-detail">
            <div class="method-heading attribute-method-heading">
              <span class="method-name">pattern</span><span
                class="attribute-access-type">[R]</span>
            </div>

            <div class="method-description">
              
              </div>
            </div>
          <div id="attribute-i-short" class="method-detail">
            <div class="method-heading attribute-method-heading">
              <span class="method-name">short</span><span
                class="attribute-access-type">[R]</span>
            </div>

            <div class="method-description">
              
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            </section>


                <section id="public-class-5Buntitled-5D-method-details" class="method-section">
                <header>
                <h3>Public Class Methods</h3>
                </header>

                  <div id="method-c-guess" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">guess</span><span
                                class="method-args">(arg)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Guesses argument style from <code>arg</code>.  Returns corresponding <a href="Switch.html"><code>OptionParser::Switch</code></a> class (<a href="Switch/OptionalArgument.html"><code>OptionalArgument</code></a>, etc.).</p>

                              <div class="method-source-code" id="guess-source">
            <pre><span class="ruby-comment"># File optparse.rb, line 519</span>
<span class="ruby-keyword">def</span> <span class="ruby-keyword">self</span>.<span class="ruby-identifier ruby-title">guess</span>(<span class="ruby-identifier">arg</span>)
  <span class="ruby-keyword">case</span> <span class="ruby-identifier">arg</span>
  <span class="ruby-keyword">when</span> <span class="ruby-string">&quot;&quot;</span>
    <span class="ruby-identifier">t</span> = <span class="ruby-keyword">self</span>
  <span class="ruby-keyword">when</span> <span class="ruby-regexp">/\A=?\[/</span>
    <span class="ruby-identifier">t</span> = <span class="ruby-constant">Switch</span><span class="ruby-operator">::</span><span class="ruby-constant">OptionalArgument</span>
  <span class="ruby-keyword">when</span> <span class="ruby-regexp">/\A\s+\[/</span>
    <span class="ruby-identifier">t</span> = <span class="ruby-constant">Switch</span><span class="ruby-operator">::</span><span class="ruby-constant">PlacedArgument</span>
  <span class="ruby-keyword">else</span>
    <span class="ruby-identifier">t</span> = <span class="ruby-constant">Switch</span><span class="ruby-operator">::</span><span class="ruby-constant">RequiredArgument</span>
  <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">self</span> <span class="ruby-operator">&gt;=</span> <span class="ruby-identifier">t</span> <span class="ruby-keyword">or</span> <span class="ruby-identifier">incompatible_argument_styles</span>(<span class="ruby-identifier">arg</span>, <span class="ruby-identifier">t</span>)
  <span class="ruby-identifier">t</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-c-incompatible_argument_styles" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">incompatible_argument_styles</span><span
                                class="method-args">(arg, t)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="incompatible_argument_styles-source">
            <pre><span class="ruby-comment"># File optparse.rb, line 534</span>
<span class="ruby-keyword">def</span> <span class="ruby-keyword">self</span>.<span class="ruby-identifier ruby-title">incompatible_argument_styles</span>(<span class="ruby-identifier">arg</span>, <span class="ruby-identifier">t</span>)
  <span class="ruby-identifier">raise</span>(<span class="ruby-constant">ArgumentError</span>, <span class="ruby-node">&quot;#{arg}: incompatible argument styles\n  #{self}, #{t}&quot;</span>,
        <span class="ruby-constant">ParseError</span>.<span class="ruby-identifier">filter_backtrace</span>(<span class="ruby-identifier">caller</span>(<span class="ruby-value">2</span>)))
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-c-new" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">new</span><span
                                class="method-args">(pattern = nil, conv = nil, short = nil, long = nil, arg = nil, desc = ([] if short or long), block = nil, &amp;_block)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="new-source">
            <pre><span class="ruby-comment"># File optparse.rb, line 543</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">initialize</span>(<span class="ruby-identifier">pattern</span> = <span class="ruby-keyword">nil</span>, <span class="ruby-identifier">conv</span> = <span class="ruby-keyword">nil</span>,
               <span class="ruby-identifier">short</span> = <span class="ruby-keyword">nil</span>, <span class="ruby-identifier">long</span> = <span class="ruby-keyword">nil</span>, <span class="ruby-identifier">arg</span> = <span class="ruby-keyword">nil</span>,
               <span class="ruby-identifier">desc</span> = ([] <span class="ruby-keyword">if</span> <span class="ruby-identifier">short</span> <span class="ruby-keyword">or</span> <span class="ruby-identifier">long</span>), <span class="ruby-identifier">block</span> = <span class="ruby-keyword">nil</span>, <span class="ruby-operator">&amp;</span><span class="ruby-identifier">_block</span>)
  <span class="ruby-identifier">raise</span> <span class="ruby-keyword">if</span> <span class="ruby-constant">Array</span> <span class="ruby-operator">===</span> <span class="ruby-identifier">pattern</span>
  <span class="ruby-identifier">block</span> <span class="ruby-operator">||=</span> <span class="ruby-identifier">_block</span>
  <span class="ruby-ivar">@pattern</span>, <span class="ruby-ivar">@conv</span>, <span class="ruby-ivar">@short</span>, <span class="ruby-ivar">@long</span>, <span class="ruby-ivar">@arg</span>, <span class="ruby-ivar">@desc</span>, <span class="ruby-ivar">@block</span> =
    <span class="ruby-identifier">pattern</span>, <span class="ruby-identifier">conv</span>, <span class="ruby-identifier">short</span>, <span class="ruby-identifier">long</span>, <span class="ruby-identifier">arg</span>, <span class="ruby-identifier">desc</span>, <span class="ruby-identifier">block</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-c-pattern" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">pattern</span><span
                                class="method-args">()</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="pattern-source">
            <pre><span class="ruby-comment"># File optparse.rb, line 539</span>
<span class="ruby-keyword">def</span> <span class="ruby-keyword">self</span>.<span class="ruby-identifier ruby-title">pattern</span>
  <span class="ruby-constant">NilClass</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                          </section>

                <section id="public-instance-5Buntitled-5D-method-details" class="method-section">
                <header>
                <h3>Public Instance Methods</h3>
                </header>

                  <div id="method-i-summarize" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">summarize</span><span
                                class="method-args">(sdone = {}, ldone = {}, width = 1, max = width - 1, indent = &quot;&quot;) { |indent| ... }</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Produces the summary text. Each line of the summary is yielded to the block (without newline).</p>
<dl class="rdoc-list note-list"><dt><code>sdone</code>
<dd>
<p>Already summarized short style options keyed hash.</p>
</dd><dt><code>ldone</code>
<dd>
<p>Already summarized long style options keyed hash.</p>
</dd><dt><code>width</code>
<dd>
<p>Width of left side (option part). In other words, the right side (description part) starts after <code>width</code> columns.</p>
</dd><dt><code>max</code>
<dd>
<p>Maximum width of left side -&gt; the options are filled within <code>max</code> columns.</p>
</dd><dt><code>indent</code>
<dd>
<p>Prefix string indents all summarized lines.</p>
</dd></dl>

                              <div class="method-source-code" id="summarize-source">
            <pre><span class="ruby-comment"># File optparse.rb, line 603</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">summarize</span>(<span class="ruby-identifier">sdone</span> = {}, <span class="ruby-identifier">ldone</span> = {}, <span class="ruby-identifier">width</span> = <span class="ruby-value">1</span>, <span class="ruby-identifier">max</span> = <span class="ruby-identifier">width</span> <span class="ruby-operator">-</span> <span class="ruby-value">1</span>, <span class="ruby-identifier">indent</span> = <span class="ruby-string">&quot;&quot;</span>)
  <span class="ruby-identifier">sopts</span>, <span class="ruby-identifier">lopts</span> = [], [], <span class="ruby-keyword">nil</span>
  <span class="ruby-ivar">@short</span>.<span class="ruby-identifier">each</span> {<span class="ruby-operator">|</span><span class="ruby-identifier">s</span><span class="ruby-operator">|</span> <span class="ruby-identifier">sdone</span>.<span class="ruby-identifier">fetch</span>(<span class="ruby-identifier">s</span>) {<span class="ruby-identifier">sopts</span> <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-identifier">s</span>}; <span class="ruby-identifier">sdone</span>[<span class="ruby-identifier">s</span>] = <span class="ruby-keyword">true</span>} <span class="ruby-keyword">if</span> <span class="ruby-ivar">@short</span>
  <span class="ruby-ivar">@long</span>.<span class="ruby-identifier">each</span> {<span class="ruby-operator">|</span><span class="ruby-identifier">s</span><span class="ruby-operator">|</span> <span class="ruby-identifier">ldone</span>.<span class="ruby-identifier">fetch</span>(<span class="ruby-identifier">s</span>) {<span class="ruby-identifier">lopts</span> <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-identifier">s</span>}; <span class="ruby-identifier">ldone</span>[<span class="ruby-identifier">s</span>] = <span class="ruby-keyword">true</span>} <span class="ruby-keyword">if</span> <span class="ruby-ivar">@long</span>
  <span class="ruby-keyword">return</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">sopts</span>.<span class="ruby-identifier">empty?</span> <span class="ruby-keyword">and</span> <span class="ruby-identifier">lopts</span>.<span class="ruby-identifier">empty?</span> <span class="ruby-comment"># completely hidden</span>

  <span class="ruby-identifier">left</span> = [<span class="ruby-identifier">sopts</span>.<span class="ruby-identifier">join</span>(<span class="ruby-string">&#39;, &#39;</span>)]
  <span class="ruby-identifier">right</span> = <span class="ruby-identifier">desc</span>.<span class="ruby-identifier">dup</span>

  <span class="ruby-keyword">while</span> <span class="ruby-identifier">s</span> = <span class="ruby-identifier">lopts</span>.<span class="ruby-identifier">shift</span>
    <span class="ruby-identifier">l</span> = <span class="ruby-identifier">left</span>[<span class="ruby-value">-1</span>].<span class="ruby-identifier">length</span> <span class="ruby-operator">+</span> <span class="ruby-identifier">s</span>.<span class="ruby-identifier">length</span>
    <span class="ruby-identifier">l</span> <span class="ruby-operator">+=</span> <span class="ruby-identifier">arg</span>.<span class="ruby-identifier">length</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">left</span>.<span class="ruby-identifier">size</span> <span class="ruby-operator">==</span> <span class="ruby-value">1</span> <span class="ruby-operator">&amp;&amp;</span> <span class="ruby-identifier">arg</span>
    <span class="ruby-identifier">l</span> <span class="ruby-operator">&lt;</span> <span class="ruby-identifier">max</span> <span class="ruby-keyword">or</span> <span class="ruby-identifier">sopts</span>.<span class="ruby-identifier">empty?</span> <span class="ruby-keyword">or</span> <span class="ruby-identifier">left</span> <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-string">+&#39;&#39;</span>
    <span class="ruby-identifier">left</span>[<span class="ruby-value">-1</span>] <span class="ruby-operator">&lt;&lt;</span> (<span class="ruby-identifier">left</span>[<span class="ruby-value">-1</span>].<span class="ruby-identifier">empty?</span> <span class="ruby-operator">?</span> <span class="ruby-string">&#39; &#39;</span> <span class="ruby-operator">*</span> <span class="ruby-value">4</span> <span class="ruby-operator">:</span> <span class="ruby-string">&#39;, &#39;</span>) <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-identifier">s</span>
  <span class="ruby-keyword">end</span>

  <span class="ruby-keyword">if</span> <span class="ruby-identifier">arg</span>
    <span class="ruby-identifier">left</span>[<span class="ruby-value">0</span>] <span class="ruby-operator">&lt;&lt;</span> (<span class="ruby-identifier">left</span>[<span class="ruby-value">1</span>] <span class="ruby-operator">?</span> <span class="ruby-identifier">arg</span>.<span class="ruby-identifier">sub</span>(<span class="ruby-regexp">/\A(\[?)=/</span>, <span class="ruby-string">&#39;\1&#39;</span>) <span class="ruby-operator">+</span> <span class="ruby-string">&#39;,&#39;</span> <span class="ruby-operator">:</span> <span class="ruby-identifier">arg</span>)
  <span class="ruby-keyword">end</span>
  <span class="ruby-identifier">mlen</span> = <span class="ruby-identifier">left</span>.<span class="ruby-identifier">collect</span> {<span class="ruby-operator">|</span><span class="ruby-identifier">ss</span><span class="ruby-operator">|</span> <span class="ruby-identifier">ss</span>.<span class="ruby-identifier">length</span>}.<span class="ruby-identifier">max</span>.<span class="ruby-identifier">to_i</span>
  <span class="ruby-keyword">while</span> <span class="ruby-identifier">mlen</span> <span class="ruby-operator">&gt;</span> <span class="ruby-identifier">width</span> <span class="ruby-keyword">and</span> <span class="ruby-identifier">l</span> = <span class="ruby-identifier">left</span>.<span class="ruby-identifier">shift</span>
    <span class="ruby-identifier">mlen</span> = <span class="ruby-identifier">left</span>.<span class="ruby-identifier">collect</span> {<span class="ruby-operator">|</span><span class="ruby-identifier">ss</span><span class="ruby-operator">|</span> <span class="ruby-identifier">ss</span>.<span class="ruby-identifier">length</span>}.<span class="ruby-identifier">max</span>.<span class="ruby-identifier">to_i</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">l</span>.<span class="ruby-identifier">length</span> <span class="ruby-operator">==</span> <span class="ruby-identifier">mlen</span>
    <span class="ruby-keyword">if</span> <span class="ruby-identifier">l</span>.<span class="ruby-identifier">length</span> <span class="ruby-operator">&lt;</span> <span class="ruby-identifier">width</span> <span class="ruby-keyword">and</span> (<span class="ruby-identifier">r</span> = <span class="ruby-identifier">right</span>[<span class="ruby-value">0</span>]) <span class="ruby-keyword">and</span> <span class="ruby-operator">!</span><span class="ruby-identifier">r</span>.<span class="ruby-identifier">empty?</span>
      <span class="ruby-identifier">l</span> = <span class="ruby-identifier">l</span>.<span class="ruby-identifier">to_s</span>.<span class="ruby-identifier">ljust</span>(<span class="ruby-identifier">width</span>) <span class="ruby-operator">+</span> <span class="ruby-string">&#39; &#39;</span> <span class="ruby-operator">+</span> <span class="ruby-identifier">r</span>
      <span class="ruby-identifier">right</span>.<span class="ruby-identifier">shift</span>
    <span class="ruby-keyword">end</span>
    <span class="ruby-keyword">yield</span>(<span class="ruby-identifier">indent</span> <span class="ruby-operator">+</span> <span class="ruby-identifier">l</span>)
  <span class="ruby-keyword">end</span>

  <span class="ruby-keyword">while</span> <span class="ruby-keyword">begin</span> <span class="ruby-identifier">l</span> = <span class="ruby-identifier">left</span>.<span class="ruby-identifier">shift</span>; <span class="ruby-identifier">r</span> = <span class="ruby-identifier">right</span>.<span class="ruby-identifier">shift</span>; <span class="ruby-identifier">l</span> <span class="ruby-keyword">or</span> <span class="ruby-identifier">r</span> <span class="ruby-keyword">end</span>
    <span class="ruby-identifier">l</span> = <span class="ruby-identifier">l</span>.<span class="ruby-identifier">to_s</span>.<span class="ruby-identifier">ljust</span>(<span class="ruby-identifier">width</span>) <span class="ruby-operator">+</span> <span class="ruby-string">&#39; &#39;</span> <span class="ruby-operator">+</span> <span class="ruby-identifier">r</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">r</span> <span class="ruby-keyword">and</span> <span class="ruby-operator">!</span><span class="ruby-identifier">r</span>.<span class="ruby-identifier">empty?</span>
    <span class="ruby-keyword">yield</span>(<span class="ruby-identifier">indent</span> <span class="ruby-operator">+</span> <span class="ruby-identifier">l</span>)
  <span class="ruby-keyword">end</span>

  <span class="ruby-keyword">self</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-switch_name" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">switch_name</span><span
                                class="method-args">()</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              <p>Main name of the switch.</p>

                              <div class="method-source-code" id="switch_name-source">
            <pre><span class="ruby-comment"># File optparse.rb, line 655</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">switch_name</span>
  (<span class="ruby-identifier">long</span>.<span class="ruby-identifier">first</span> <span class="ruby-operator">||</span> <span class="ruby-identifier">short</span>.<span class="ruby-identifier">first</span>).<span class="ruby-identifier">sub</span>(<span class="ruby-regexp">/\A-+(?:\[no-\])?/</span>, <span class="ruby-string">&#39;&#39;</span>)
<span class="ruby-keyword">end</span></pre>
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